Advanced Materials Research Vol. 771

Abstract: In this work, polystyrene/ graphene nanocomposite foams were prepared using supercritical carbon dioxide. Chemically reduced graphene oxide were incorporated into PS using latex mixing. Subsequently, the nanocomposites were foamed with supercritical CO2, the foaming temperature is varied. The morphology and electrical properties of the foamed samples were discussed. It is suggested that foaming temperature has significant influence on the morphology of foams. For those samples foamed at higher temperature, foams have thin cell wall and low density even when the content of graphene is relatively high, while they possess good electrical conductivity, may be used as light weight functional materials.

Abstract: The effects of reflux time and pH on the photocatalytic properties of N-TiO₂ photocatalyst were researched, which was prepared from titanium n-butoxide by reflux method at low temperature employing triethylamine as nitrogen source. The N-TiO₂ catalysts prepared prepared with reflux time for 6 h and 12 h shown better visible-light photocatalytic activity.

Abstract: Sr, Ca and Fe doped cathode materials Ln_0.7Sr_0.2Ca_0.1Co_0.7Fe_0.3O_2.85 (LnSCCF, Ln=La, Pr and Nd; abbreviated as L-72173, P-72173 and N-72173) were synthesized by microwave sintering (MWS) techniques. The formation process, phase structure and composition were characterized using TG/DTA, XRD and EDS. The thermal expansion behavior of the samples was analyzed in the range of 20-950 °C by thermal dilatometer. The electrical conductivity of the samples was measured with DC four-terminal method from 25 to 900 °C. The X-ray diffraction shows that the samples exhibit a single phase with rhombohedral or cubic perovskite structure after sintered at 1200 °C for 20 min. The electrical conductivity of the samples increases with temperature up to a maximum, and then decreases gradually at higher temperature owing to the creation of oxygen vacancies. The small polaron hopping is regarded as the conducting mechanism (T 550 °C). L-72173 has higher mixed conductivity ( >300 S·cm^-1) in 550-800 °C. The average TECs of L-72173, P-72173 and N-72173 are 1.389× 10^-5 K^-1, 1.417 × 10^-5 K^-1 and 1.416 × 10^-5 K^-1 in the range of 25-800 °C, respectively. They are thermally matched to the GDC better than the YSZ and SDC.

Abstract: Tricardanolic phosphite was synthesized in 65% yield. This cardanol-derived small molecular compound was successfully transformed into UV-cured resin via thiol-ene click reaction, by using 4,4-di (mercaptomethyl) benzophenone as both a photoinitiator and a crosslinker. The fully bio-based P-and S-containing resin is expected to be flame-retardant materials.

Abstract: Transparent indium gallium zinc oxide (IGZO) thin film was fabricated on SiO₂/Si substrate by radio-frequency magnetron sputtering method. The IGZO thin film was characterized by X-ray diffraction, UV-VIS spectrometer, X-ray photoelectron energy spectrum to determine its optical, structural properties and binding energy information. The IGZO thin film was employed to construct metal-oxide-semiconductor field effect transistors (MOS-FET), which showed an on/off current of about 10³. When the device was illuminated by UV light, the drain-to-source current was increased by 15 folders at -5 V gate voltages. The result indicates that the IGZO MOS-FET is sensitive to UV light.

Abstract: Based on MTTSD (Magneto-rheological Torque Transmission Servo Devices) and force-position decoupling control technology, an aspheric surface NC polishing project is put forward. The aspheric surface polishing fundamental theory is researched. Under the condition of a constant material removal rate, a new aspheric surface polishing model is brought forward. In addition, under the condition of a constant material removal rate, this paper brought up a polishing force control model and a workpiece rotating speed control model, according to witch, force and rotating speed change with the coordinates of working points, and variation curves are drawn.CLC Number: TH166 Document Identifier: A

Abstract: t is possible to get electroforming deposit with numerous special functions by adoption of traditional electroforming technique, but in which there are defects such as uneven electroforming deposit and unstable performance, etc. In order to enhance the quality and speed of electroforming deposit, this article has proposed the particle flow erosion precision electroforming technology, particle flows such as huge amount of micro glass bead is used in the process of electro-deposit for erosion of electroforming deposit surface, so that micro glass beads continuously abrade and impact cathode surface. As indicated in electroforming test of metallic nickel, in comparison with traditional electroforming technology, particle flow erosion precision electroforming technology can effectively change the microscopic structure of electroforming deposit, refine grain and realize evener distribution of grains, so as to reduce the diffracted intensity of all crystal faces and enhance mechanical property of electroforming deposit.

Abstract: This paper deals with the investigation of the bending properties of rubber mortar with the inclusion of SBRL (butylbenzene latex) and PP (polypropylene) fiber. The results proved the elasticity modulus of modified mortar decreased, especially when modified materials groups were SBRL10 %+R30%+PP, the elasticity modulus of mortar was minimum and the flexibility was the best. The deflection increased with the inclusion of modified materials, especially when 30 vol.% of rubber was included in mortar. The specimens containing 20 vol.% of rubber exhibited post failure loads and the peak load of polypropylene fiber and SBR latex modified rubber mortar with 20 vol.% of rubber grew, whether specimens were included with polypropylene fiber or not.

Abstract: This paper presents a study on the mechanical properties of rubber mortar with the inclusion SBRL (butylbenzene latex) and PP (polypropylene) fiber and the microstructures of SBR latex modified mortar were analyzed. The results proved for specimens with 20 vol.% of rubber, when the P/C of SBR latex was 10%, the compressive and flexural strength of SBR latex modified rubber mortar was optimal. Besides, for specimens with 20 vol.% of rubber, the compressive and flexural strength of SBR latex and polypropylene fiber modified rubber mortar increased with the inclusion of polypropylene fiber, especially when the P/C of SBR latex was 10%. Through scanning electron microscope (SEM), it was founded that polymer has formed a consecutive reticulate film which has a toughening effect on cement matrix.

Abstract: Biomorphic TiO₂ was respectively prepared by two different titania sol infiltration routes. The morphology and microstructure of TiO₂ samples were characterized by scanning electron microscopy. The results suggest that the final TiO₂ poorly replicates the shape and microstructure of carbon template by repeating five infiltration procedures. By another repeated infiltration/pyrolysis route, the TiO₂ better retains the shape and part microstructure of carbon template.